Restructure the "Drupal Speaks", "Why consider speech?" and "Dynamic applications undergo state and property changes" section to be grouped more logically."
Restructure the "ARIA-Live", "Drupal.announce", "Wait, doesn't this accessibility feature depend on JavaScript" and "How to implement Drupal.announce" slides.

More logical structure, much more (visually) legible table, etc.
Finish the devel_a11y slides; include screenshots.